River Ivel

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River Ivel
Footbridge at Radwell
Location
CountryUnited Kingdom.
CountiesHertfordshire and Bedfordshire
SettlementsBaldock, Radwell, Stotfold, Arlesey, Henlow, Langford, Biggleswade, Sandy, Tempsford.
ContinentEurope
Constituent CountryEngland
Physical characteristics
Source 
 • locationIvel Springs, Baldock.
 • coordinates51°59′35″N 0°11′31″W / 51.99310°N 0.19194°W / 51.99310; -0.19194
 • elevation57 metres (187 ft)[1]
MouthRiver Great Ouse
 • location
Tempsford, Bedfordshire
 • coordinates
52°10′04″N 0°18′14″W / 52.16767°N 0.30384°W / 52.16767; -0.30384
 • elevation
16 metres (52 ft)[2]
Length21 mi (34 km)[3]
Basin features
ProgressionRiver Ivel → Great Ouse → North Sea
Tributaries 
 • leftPix Brook, River Hiz, Henlow Brook, River Flit, River Hit and Ickwell Brook.
 • rightPotton Brook[4] and Cat Ditch.

The River Ivel (/ˈaɪvəl/ ) is a chalk stream in England. It rises at Ivel Springs in Baldock, it flows primarily through Bedfordshire before joining the River Great Ouse at its confluence near Tempsford. The river has a length of 21 mi (34 km). The River Ivel catchment is bounded by the Chiltern Hills to the south and the Greensand Ridge to the north. The River Ivel and its tributaries rise from the springs in the Chiltern Chalk. The river also rises in the East Anglian Chalk.

The Ivel was made navigable under the River Ivel Navigation Act 1757 and it was used for supplying coal and timber to the towns of Biggleswade and Shefford. The canal was extended to Shefford in 1823. Locks were built in Biggleswade, Holme, Stanford and Clifton. The canal was abandoned in 1876, when a dam was built across it at Sandy. The Great Northern Railway caused its gradual decline of the usage of the Ivel Navigation.

In 2021, the Environment Agency released 1,412 barbel into the River Ivel at Biggleswade Mill and Blunham weir.

Geography

The river emerging at Ivel Springs
The river at Ivel Springs, the river’s source.[5]

The total length of the river is 21 mi (34 km).[3] Its source is at Ivel Springs near Baldock at an elevation of 57 m (187 ft).[1] The River Ivel flows through the settlements of Radwell, Stotfold, Arlesey, Henlow, Langford, Biggleswade, Sandy, and Blunham, before joining the River Great Ouse near Tempsford at an elevation of 16 m (52 ft).[3][2] The River Ivel catchment is bounded by the Chiltern Hills to the south and the Greensand Ridge to the north. The River Ivel and its tributaries rise from the springs in the Chiltern Chalk,[6] while the River Ivel also rises in the East Anglian Chalk.[7] It passes through its course to join the Great Ouse.[7] Other watercourses (Running Waters, Chicksands Brook and Millbridge-Common Brooks) rise from the Woburn Sands aquifer. The River Ivel headwaters are predominant in the North Hertfordshire towns of Hitchin, Letchworth and Baldock and the Bedfordshire towns of Ampthill, Biggleswade and Sandy.[6]

The river at Blunham
River Ivel north of Blunham

Tributaries

There are eight notable tributaries of the River Ivel including:

Geology

A colour coded geological map
A geological map of the Victorian county of Bedford

In the county of Bedfordshire, there are two sources of aggregate: Pleistocene river and glacial gravel and sands. The valley gravels lie in the Ivel valley.[17] For part of its extent, it is concealed by the boulder clay and alluvium of the valley of the Ivel, and it attains an elevation in the vicinity of Sandy, having a prominent escarpment and its maximum thickness of 220 feet (67 m).[11] In addition to the Ivel valley, Glacio-fluvial deposits are present.[18] Less extensive deposits, in places interbedded with organic muds, occur beside the River Ivel, north of Baldock.[19] Extensive spreads of gravel extend along the Ivel valley.[20] In the New Town church pits, geological data by Edmonds and Dinham in 1965, listed in the table below, recorded:[20]

Geological data by Edmonds and Dinham (1965)
Coarse Gravel Grey Gravel Sandy Ocherous Gravel Flint Quartzite Chalk
1.21 m (4 ft 0 in)[20] 1.36 m (4 ft 6 in)[20] 1.21 m (4 ft 0 in)[20] 45%[20] 5%[20] 50%[20]

North of Biggleswade, 10.05 m (33.0 ft) of sand and gravel rests on the Woburn Sands.[20] In a quarry south of Sandy, excavated deposits of the First Terrace revealed the deposition occurring as bars and sheets in a braided river regime.[20] Fossilferous silt within the gravel indicate the deposition accumulated under slow moving or still water in an abandoned meander channels.[20] In Bedfordshire, Lower Cretaceous sandstones are present. The sandstone produces an escarpment which is the Greensand Ridge.[18] It is clear that this feature is around Sandy, where the River Ivel cuts through it.[18]

Ecology

One nature reserve on the River Ivel are the Ivel Springs, the river's source. It has areas of wildlife, including woodland, wetland and pasture.[5] Species in the River Ivel catchment include populations of water vole and otter.[6] The Environment Agency released 1,412 barbel into the River Ivel at Biggleswade Mill and Blunham weir in late 2021.[21]

A study published in the 1960s described the Rivel Ivel as an 'unpolluted chalk stream'. The activity of attached plants and mud kept planktonic algal populations relatively low. The average water velocities rarely exceeded 6 cm (2.4 in)/s in the River Ivel.[22]

Hydrology

The River Ivel at Biggleswade has a normal depth range from 0.13–0.48 m (13–48 cm). On 11 February 2009, it reached a depth of 1.14 m (114 cm).[23] In Blunham, the normal depth range is 0.18–0.55 m (18–55 cm). Its greatest depth was on 3 January 2003, at a depth of 1.45 m (145 cm).[24] The station at Blunham is a crump-weir at a width of 7.31 m (24.0 ft).[25] The Environment Agency splits the River Ivel in two: Ivel (US Henlow) and Ivel (DS Langford to Roxton).[6] Ivel (US Henlow) has a length of 9.669 km (6.008 mi) and a catchment area of 32.318 km2 (12.478 sq mi).[26] Ivel (DS Langford to Roxton) has a length of 19.665 km (12.219 mi) and a catchment area of 43.565 km2 (16.821 sq mi).[27]

A study published in the mid-1990s described the River Ivel per km fall as less than one metre, compared to Pix Brook's noted 'relatively steep' gradient of 2.8 m (9 ft 2 in) per km fall.[28] The River Ivel is a chalk stream, because it receives baseflow from underlying chalk aquifers. The river and its catchment area, particularly the wetland and the springs, have been heavily modified. The large part of the site was covered with commercial watercress beds, exceeding the surrounding area,[29] with historical maps showing watercress beds north of Baldock.[30]

Water quality

The Environment Agency measures the water quality of the river systems in England. Each is given an overall ecological status, which may be one of five levels: high, good, moderate, poor and bad. There are several components that are used to determine this, including biological status, which looks at the quantity and varieties of invertebrates, angiosperms and fish; chemical status, which compares the concentration of various chemicals against known safe concentrations. Chemical status is rated good or fail.[31]

River Ivel water quality in 2019
Water body name Ecological status Chemical Biological quality elements Hydromorphological designation
Ivel (US Henlow)[26] Good Fail Good Heavily modified
Ivel (DS Langford to Roxton)[27] Moderate Fail Good Heavily modified

History

The Gifle were inhabitants of the River Ivel, where its name remains in the villages of Northill and Southill on the 1086 Domesday Book,(Nortgiuele, Sudgiuele).[32][33]

River Ivel Navigation Act 1757
Act of Parliament
coat of arms
Parliament of Great Britain
Long titleAn Act for making the River Ivel and the Branches there of navigable, from the River Great Ouse at Tempsford in the County of Bedford, to Shotling Mill otherwise called Burnt Mill in the Parish of Hitchin in the County of Hertford, and to Black Horse Mill, in the Parish of Bygrave in the said County of Hertford, and to the South and North Bridges in the Town of Shefford in the said County of Bedford.
Citation30 Geo. 2. c. 62
Territorial extent Great Britain
Dates
Royal assent17 May 1757
Commencement2 December 1756[a]
Other legislation
Relates to
  • Ivel Navigation (Abandonment) Act 1876
Status: Current legislation
Text of statute as originally enacted
Holme Mill Iron Bridge, a Scheduled monument.[34]

The Rivel Ivel was made navigable for approximately 11 mi (18 km) south in Bedford under the River Ivel Navigation Act 1757 (30 Geo. 2. c. 62).[35] Locks had been constructed at Tempsford, Blunham, South Mills, and Sandy. In 1758, five locks were built from Tempsford to Biggleswade, at a cost of £6,000.[36] The river was made navigable for supplying coal and timber to the towns of Biggleswade and Shefford. The canal had been extended to Shefford in 1823, with locks at Biggleswade, Holme, Stanford and Clifton.[3][37]

Ivel Navigation (Abandonment) Act 1876
Act of Parliament
coat of arms
Parliament of the United Kingdom
Long titleTo provide for the closing of the Ivel Navigation; the Extinction of the Commission; and for other purposes.
Citation39 & 40 Vict. c. cxiv
Territorial extent United Kingdom
Dates
Royal assent13 July 1876
Other legislation
Relates to
  • River Ivel Navigation Act 1757
Text of statute as originally enacted

The canal was abandoned when a dam was built across it at Sandy, having been authorised by the Ivel Navigation (Abandonment) Act 1876 (39 & 40 Vict. c. cxiv). The introduction of the Great Northern Railway caused its decline of the usage of the canal. Remnants, such as Holme Lock, remain close to Jordan's Mill.[3]

Stotfold Mill, restored after the 1992 fire.

Stotfold Mill, a Grade-II listed watermill on the River Ivel, had one of the widest corn waterwheels in the United Kingdom.[38] It is one of four mills in Stotfold recorded on the 1086 Domesday Book.[38][39] It is recorded as an early 19th-century structure of gault bricks, with additions and alterations made in the late 19th-century.[40] The earlier parts of the building have weatherboarding on the upper floors.[40] It was destroyed by a fire in 1992 and subsequently rebuilt by the Stotfold Mill Preservation Trust.[38] Other corn mills along the river include Bowman's Mill at Astwick, now a Grade II listed private home,[41][42] Holme Mill at Holme, still working as a museum,[43] and Franklin's Mill at Biggleswade,[44] converted to apartments. In the 1880s, a map was published and it included a lock, weir, and a mill near Sandy, which is called Sandy Mill,[45] and notably a bridge named "Girtford Bridge" is a Grade II listed building dated in 1783 with three slightly flattened arches.[46] A map published in the 1900s included a mill near Norton, a corn mill in Radwell and Blackhorse Farm near Baldock.[47]

See also

Notes

  1. Start of session.

References

  1. "Detailed maps & routes to explore across the UK | (River Ivel Source) | OS Maps". Ordnance Survey. Retrieved 9 May 2026.
  2. "Detailed maps & routes to explore the UK | (River Ivel Mouth) | OS Maps". Ordnance Survey. Retrieved 10 May 2026.
  3. Chris Howes (2023). The River Great Ouse and its Tributaries: including the Rivers Cam, Lark, Little Ouse & Wissey, Hundred Foot River, Relief Channel. Imray, Laurie, Norie and Wilson Ltd. p. 53. ISBN 978-1-78679-568-7. Retrieved 3 May 2026.
  4. Marshall G. Hall (2024). Medieval Bridges of Middle England. Windgather Press. p. 26. ISBN 978-1-914427-30-5.
  5. "Natural England - Special Sites". www.lnr.naturalengland.org.uk. Natural England. Archived from the original on 7 February 2015. Retrieved 1 August 2026.
  6. "Ivel Operational Catchment | Catchment Data Explorer". Catchment Data Explorer. Environment Agency. Retrieved 25 April 2026.
  7. "Description". National Character Area Profiles. Retrieved 4 August 2026.
  8. "Pix Brook | Catchment Data Explorer | Catchment Data Explorer". environment.data.gov.uk. Retrieved 18 July 2026.
  9. OS Explorer 193 | Luton & Stevenage | Hitchin & Ampthill | (Map). 1:25000. Ordnance Survey. September 2015. ISBN 978-0319243862.
  10. Frederic Seebohm (1896). "The" English Village Community. Longmans. p. 429.
  11. Page, William; Doubleday, H. Arthur (Herbert Arthur) (1904). The Victoria history of the county of Bedford. Cornell University Library. Westminster [A. Constable]. pp. 10–145. Retrieved 18 July 2026.
  12. "Cat Ditch | Catchment Data Explorer | Catchment Data Explorer". environment.data.gov.uk. Retrieved 18 July 2026.
  13. Page, William (1902). The Victoria history of the county of Hertford. Allen County Public Library Genealogy Center. Westminster [etc., A. Constable & company, limited]. p. 270.
  14. "Ickwell Brook | Catchment Data Explorer | Catchment Data Explorer". environment.data.gov.uk. Retrieved 19 July 2026.
  15. "Henlow Brook | Catchment Data Explorer | Catchment Data Explorer". environment.data.gov.uk. Retrieved 19 July 2026.
  16. "Anglian River Basin District Draft Flood Risk Management Plan 2021 to 2027" (PDF). consult.environment-agency.gov.uk. Environmebt Agency. October 2021. p. 269.
  17. Tony Brown (2009). The Environment and Aggregate-Related Archaeology. Oxbow Books. p. 167. ISBN 978-1-78297-280-8.
  18. Dr. Timothy Farewell, Dr. Peter Friend, Dr. Martin Whiteley, Joanna Zawadzka. "The mapping of landscapes, geology and soils of Bedfordshire and Cambridgeshire". dspace.lib.cranfield.ac.uk. Cranfield University. pp. 3–4.{{cite web}}: CS1 maint: multiple names: authors list (link)
  19. "Geology of the country around Hitchin. Memoir for 1:50 000 Geological Sheet 221". webapps.bgs.ac.uk. British Geological Survey. Retrieved 20 June 2026.
  20. "Biggleswade district, sheet 204, brief explanation". webapps.bgs.ac.uk. Retrieved 26 July 2026.
  21. "Fish restocked in Norfolk and Bedfordshire rivers after pollution incident". BBC News. 21 December 2021. Retrieved 4 October 2026.
  22. Southgate, B. A. (2 October 2013). Advances in Water Pollution Research: Proceedings of the International Conference Held in London, September 1962. Elsevier. p. 324. ISBN 978-1-4832-8391-3.
  23. "River Ivel level at Biggleswade - GOV.UK". check-for-flooding.service.gov.uk. Retrieved 27 May 2026.
  24. "River Ivel level at Blunham - GOV.UK". check-for-flooding.service.gov.uk. Retrieved 27 May 2026.
  25. "Station | National River Flow Archive". nrfa.ceh.ac.uk. National River Flow Archive. Retrieved 3 August 2026.
  26. "Ivel (US Henlow) | Catchment Data Explorer | Catchment Data Explorer". environment.data.gov.uk. Retrieved 27 June 2026.
  27. "Ivel (DS Langford to Roxton) | Catchment Data Explorer | Catchment Data Explorer". environment.data.gov.uk. Retrieved 27 June 2026.
  28. Bubb, I. M.; Lester, J. N. (1 May 1996). "Factors controlling the accumulation of metals within fluvial systems". Environmental Monitoring and Assessment. 41 (1): 88–89. doi:10.1007/BF00394249. ISSN 1573-2959 – via Springer Nature.
  29. "How we're revitalising the River Ivel". Affinity Water. Retrieved 4 October 2026.
  30. "View map: Ordnance Survey, Hertfordshire VII.NE (includes: Baldock; Bygrave; Clothall; Letchworth; Newnham; Radwell; Stotfold.) - Ordnance Survey Six-inch England and Wales, 1842-1952". maps.nls.uk. Archived from the original on 27 May 2025. Retrieved 25 October 2026.
  31. "Glossary (see Biological quality element; Chemical status; and Ecological status)". Catchment Data Explorer. Environment Agency. Retrieved 15 May 2017.
  32. Williamson, Tom (1 September 2010). The Origins of Hertfordshire. Hertfordshire Publications. p. 74. ISBN 978-1-907396-07-6.
  33. Reaney, P. H. (28 February 2026). The Origin of English Place-Names. Taylor & Francis. p. 98. ISBN 978-1-040-88774-5.
  34. "Holme Mill Iron Bridge, Southill - 1005395 | Historic England". historicengland.org.uk. Retrieved 27 June 2026.
  35. Clarke, Mike (December 2021). "The Inland Waterways of Great Britain and Ireland in Parliament" (PDF). Railway and Canal Historical Society. p. 43.
  36. Skempton, A. W. (2002). A Biographical Dictionary of Civil Engineers in Great Britain and Ireland. Thomas Telford. ISBN 978-0-7277-2939-2.
  37. Priestley, Joseph (1831). Historical Account of the Navigable Rivers, Canals, and Railways, Throughout Great Britain: As a Reference to Nichols, Priestley & Walker's New Map of Inland Navigation, Derived from Original and Parliamentary Documents in the Possession of Joseph Priestley, Esq. Longman, Rees, Orme, Brown and Green. p. 379.
  38. "Stotfold Mill". Historic England. Retrieved 25 April 2026.
  39. Chambers, C. Gore; Fowler, G. Herbert; Brown, J. E.; Page-Turner, F. A.; Austin, William (1913). The Publications of the Bedfordshire Historical Record Society volume I. Boydell & Brewer. p. 72.
  40. "Stotfold Mill, Stotfold - official list entry". Historic England. 18 February 2026. Retrieved 27 June 2026.
  41. "Bowman's Mill, Astwick". Mills Archive. Retrieved 7 June 2026.
  42. "Bowman's Water Mill, Astwick - 1393880 | Historic England". historicengland.org.uk. Retrieved 7 June 2026.
  43. "Holme Mills, Holme". Mills Archive. Retrieved 7 June 2026.
  44. "Franklin's Mill, Biggleswade". Mills archive. Retrieved 7 June 2026.
  45. "View map: Ordnance Survey, Bedfordshire XVIII.NW (includes: Biggleswade; Northill; Sandy; Sutton.) - Ordnance Survey Six-inch England and Wales, 1842-1952". maps.nls.uk. National Library of Scotland (NLS; Leabharlann Nàiseanta na h-Alba; Naitional Leebrar o Scotland). Retrieved 12 July 2026.
  46. "Girtford Bridge, Sandy - 1114503 | Historic England". historicengland.org.uk. Historic England. Retrieved 12 July 2026.
  47. "View map: Ordnance Survey, Bedfordshire XXVII.NE (includes: Baldock; Bygrave; Clothall; Letchworth; Newnham; Radwell; Stotfold.... - Ordnance Survey Six-inch England and Wales, 1842-1952". maps.nls.uk. National Library of Scotland (NLS; Leabharlann Nàiseanta na h-Alba; Naitional Leebrar o Scotland). Retrieved 11 July 2026.

This article contains OGL licensed text This article incorporates text published under the British Open Government Licence v3.0: "Ivel Operational Catchment | Catchment Data Explorer". Catchment Data Explorer. Environment Agency. Retrieved 25 April 2026.

Bibliography